Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 1105186: A species of bacteria doubles every 2 hours, so that a culture of 200 bacteria would grow to 400 after 2 hours and 800 after 4 hours. If there were b bacteria initially, which of the following expressions correctly describes the amount of bacteria present after one day?
Click here to see answer by Boreal(15235)   |
Question 1105184: A meteorologist estimates how long a passing storm will last by using the function t(d) = 0.08d^3/2, where d is the diameter of the storm, in miles, and t is the time, in hours. If the storm lasts 16.2 minutes, find its diameter, in miles.
Click here to see answer by Boreal(15235) |
Question 1105275: Hi! I came across this problem in a CLEP practice test, and I'd never had any experience with it before. I'm not exactly sure how to look for tutorials because I don't know what this particular kind of problem is called. Here it is: If ln(√x) = 5 and ln(y3) = 3, what is ln(x2y)? Can you help me learn how to solve this? Thank you!
Click here to see answer by rothauserc(4718)  |
Question 1104940: X -4, -3, 0, 1, 3,
f(x) -2, -5, __, -9, __,
g(x) 1, 7, -4, __, __,
(f-g) __, -12, __, -13, -5,
(f/g)(x) -2, __, 3/2, __, 7/2,
Click here to see answer by greenestamps(13200)  |
Question 1104551: Please help me solve this word problem:
in 1991, the average cost of attending a public university through graduation. Was $20,972. If johns parents deposited that amount in an account in 1991 at an interest rate of 7% compounded semi-annually, how long will it take for the money to double? Round answer to two decimals.
Click here to see answer by Boreal(15235) |
Question 1104551: Please help me solve this word problem:
in 1991, the average cost of attending a public university through graduation. Was $20,972. If johns parents deposited that amount in an account in 1991 at an interest rate of 7% compounded semi-annually, how long will it take for the money to double? Round answer to two decimals.
Click here to see answer by Theo(13342)  |
Question 1104553: Please help me solve this word problem:
The number of households using online banking services has increased from 754,000 in 1995 to 12,980,000 in 2000. The formula H(t)=0.76e^0.55t models the number of households H in millions when time is t years since 1995. In what year was it estimated that 50,000,000 households would use online banking services?
Click here to see answer by Theo(13342) |
Question 1106165: Johnny has x rows of boxes, each row containing another x boxes. If the number of boxes Johnny has is equal to one-fifth of the number of boxes that Kelsey has, what is the value of x when Kelsey has 1280 boxes?
Click here to see answer by ikleyn(52800)  |
Question 1106244: Solve for t algebraically. Round answers to the nearest hundredth.
100(1/2)^t/5 = 20
So,I know you divide the whole equation by 100,which leaves me with,
(1/2)^t/5 = 1/5
Then I take the log of each side, my book tells me to use ln, so I end up with
ln(1/2)^t/5 = ln 1/5
Move t/5 over, now I get
t/5 ln(1/2) = ln 1/5
Multiply everything by 5
t ln(1/2) = 5 ln 1/5
Is that correct? I've tried everything I can think of, yet I still get the wrong answer. Would you please help me?
Click here to see answer by Alan3354(69443)  |
Question 1106245: IF Annabelle invests $200 at 3% interest rate for t years, she will have the amount A= 200(1.03)^t dollars. How many whole years must Annabelle wait for the amount to reach 500? So,obviously I plug in 500 as A,and I end up with,
500=200(1.03)^t
Divide by 200
2.5=1.03^t
So,er...what now?
Click here to see answer by josmiceli(19441)  |
|
Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910
|
